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Control Strategies of Induction Motor Fed by Tandem Converter
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| Author(s) |
M. Imecs; I.I. Incze; C. Szabó |
| Abstract |
The paper deals with vector control structures for the “tandem” frequency converter fed induction
motor drives. This type of converter is composed of an amplitude-modulated current-source inverter
and a PWM voltage-source one connected in parallel arrangement. In tandem operation mode the two
converters require synchronization in time and in the magnitude of the currents in order to avoid
energy circulation between them, otherwise the low power range PWM inverter will be uncontrolled
overloaded. In comparison with an equivalent PWM converter in tandem running of the two
component ones the switching losses will be smaller because the most part of the energy is
transferred without modulation. Due to the voltage-source behaviour of the tandem converter it needs
special control structures, where the PWM inverter will have the role of the motor actuator. Rotorfield-
oriented vector control methods using “bang-bang” current-feedback modulation and voltage
feedforward PWM are presented, and compared with stator-field-oriented vector control suitable only
for proper stator-voltage control. Performance problems of the different control schemes related to
PWM methods, control variable computation and orientation-field identification are outlined. Three
characteristic control structures for induction motor drive systems were simulated using MATLABSimulink-
environment. |
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| Filename: | EPE2001 - PP00897 - Imecs.pdf |
| Filesize: | 873.1 KB |
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| Type |
Members Only |
| Date |
Last modified 2004-03-11 by System |
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